Molten lava bao are made with a runny egg custard-like center; it’s sweet and slightly salty. The black color I think comes from charcoal powder. I always like to end my dim sum meals with this if its available.

No need to travel to Hong Kong. Plenty of places in San Francisco sell them and I assume many other dim sum places around the world.

Nothing fishy; it’s charcoal powder. The taste is a little difficult to describe but it doesn’t taste bitter or burnt.